What should I do?

A riding to the app and another one that I use I'm about 4 days late. My last Pd was on August 30th and lasted about 4 day...now today being the first of oct I think I'm only 2 day late...  I went off birth control a while ago ( not really sure how long at least 6 months)  and my cycles have been normal.. I could just be over reacting here but I want to take best care of the baby if I'm pregnant